Solve for x: x² - 10x + 21 = 0
- A. x = 3 or x = 7 ✓
- B. x = 4 or x = 6
- C. x = 3 or x = 8
- D. x = -3 or x = -7
Correct answer
A. x = 3 or x = 7
Explanation
Factor the quadratic: (x - 3)(x - 7) = 0, so x = 3 or x = 7.
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